As an author, I need to use my real name as a display name in posts on my Wordpress site. 

The thing is, I don't want to use my real name as a name on forums, because it's too formal for our leisure community. If I change it in wpForo, it will change in Wordpress too and vice versa.

Is it possible to somehow display different name from rest of the Wordpress site? To use nick instead of Display Name? Some custom function or something?

Hope you will understand me and thank you in advance for any help.